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JUnit is a regression testing framework written by Erich Gamma and Kent Beck. It is used by the developer who implements unit tests in Java.

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/**
 *
 */
package org.junit.internal.builders;

import java.util.Arrays;
import java.util.List;

import org.junit.runner.Runner;
import org.junit.runners.model.RunnerBuilder;

public class AllDefaultPossibilitiesBuilder extends RunnerBuilder {
	private final boolean fCanUseSuiteMethod;

	public AllDefaultPossibilitiesBuilder(boolean canUseSuiteMethod) {
		fCanUseSuiteMethod= canUseSuiteMethod;
	}

	@Override
	public Runner runnerForClass(Class testClass) throws Throwable {
		List builders= Arrays.asList(
				ignoredBuilder(),
				annotatedBuilder(),
				suiteMethodBuilder(),
				junit3Builder(),
				junit4Builder());

		for (RunnerBuilder each : builders) {
			Runner runner= each.safeRunnerForClass(testClass);
			if (runner != null)
				return runner;
		}
		return null;
	}

	protected JUnit4Builder junit4Builder() {
		return new JUnit4Builder();
	}

	protected JUnit3Builder junit3Builder() {
		return new JUnit3Builder();
	}

	protected AnnotatedBuilder annotatedBuilder() {
		return new AnnotatedBuilder(this);
	}

	protected IgnoredBuilder ignoredBuilder() {
		return new IgnoredBuilder();
	}

	protected RunnerBuilder suiteMethodBuilder() {
		if (fCanUseSuiteMethod)
			return new SuiteMethodBuilder();
		return new NullBuilder();
	}
}